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LM342 PDF预览

LM342

更新时间: 2024-11-25 22:51:55
品牌 Logo 应用领域
美国国家半导体 - NSC 三端稳压器
页数 文件大小 规格书
6页 127K
描述
3-Terminal Positive Regulators

LM342 数据手册

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June 1989  
LM342 Series  
3-Terminal Positive Regulators  
General Description  
The LM342-XX series of three-terminal regulators is avail-  
able with several fixed output voltages, making them useful  
in a wide range of applications. One of these is local on card  
regulation, eliminating the distribution problems associated  
with single point regulation. The voltages available allow  
these regulators to be used in logic systems, instrumenta-  
tion, HiFi, and other solid state electronic equipment. Al-  
though designed primarily as fixed voltage regulators these  
devices can be used with external components to obtain  
adjustable voltages and currents.  
output, although this does improve transient response. Input  
bypassing is needed only if the regulator is located far from  
the filter capacitor of the power supply.  
For output voltage other than 5V, 12V and 15V the LM117  
series provides an output voltage range from 1.2V to 57V.  
Features  
Y
Output current in excess of 0.25A  
Y
Internal thermal overload protection  
Y
No external components required  
The LM342-XX series is available in the plastic TO-202  
package. This package allows these regulators to deliver  
over 0.25A if adequate heat sinking is provided. Current lim-  
iting is included to limit the peak output current to a safe  
value. Safe area protection for the output transistor is pro-  
vided to limit internal power dissipation. If internal power  
dissipation becomes too high for the heat sinking provided,  
the thermal shutdown circuit takes over, preventing the IC  
Y
Output transistor safe area protection  
Y
Internal short circuit current limit  
Y
Available in plastic TO-202 package  
Y
Special circuitry allows start-up even if output is pulled  
g
to negative voltage ( supplies)  
Voltage Range  
5V  
from overheating.  
LM342-5.0  
LM342-12 12V  
LM342-15 15V  
Considerable effort was expended to make the LM342-XX  
series of regulators easy to use and minimize the number of  
external components. It is not necessary to bypass the  
Schematic Diagram  
TL/H/10485–1  
C
1995 National Semiconductor Corporation  
TL/H/10485  
RRD-B30M115/Printed in U. S. A.  

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